メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7937500 26.7250000, 127.8000000 26.7250000, 127.8000000 26.7291667, 127.7937500 26.7291667, 127.7937500 26.7250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral